Synthetic Studies Towards theO-Specific Polysaccharide ofShigella Sonnei
摘要:
Synthetic routes are described to zwitter-ionic disaccharides that are diastereoisomerically related to frame-shifted repeating units of the title polysaccharide that contains 2-acetamido-4-amino-2,4,6-trideoxy-D-galactose and 2-acetamido-2-deoxy-L-altruronic acid. The intermediates corresponding to the trideoxygalactose residue feature acylamino functions at C-2 and an azido group at C-4. Best results were obtained with N-phthaloyl- and N-trichloroacetyl-protected derivatives. The intermediates corresponding to the uronic acid residue were either a D-altruronic acid-derived acceptor or a D-altrose-derived donor in which C-6 was oxidized after disaccharide formation.
Synthesis of building blocks for an iterative approach towards oligomers of the <i>Streptococcus pneumoniae</i> type 1 zwitterionic capsular polysaccharide repeating unit
作者:Aisling Ní Cheallaigh、Stefan Oscarson
DOI:10.1139/cjc-2016-0006
日期:2016.11
extendable trisaccharidebuildingblocks of the zwitterionic capsularpolysaccharides of Spt1 is described. Key elements include the comparison of pre-glycosylation oxidation and post-glycosylation oxidation approaches using thioglycoside donors to the target trisaccharide, the optimisation of the post-glycosylation oxidation approach, and the conversion of the trisaccharide to buildingblocks tailored